/**
 * Copyright (C) 2011 Taobao Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.taobao.jaket.adapter;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;

import com.taobao.jaket.Builder;
import com.taobao.jaket.model.TypeDefinition;

/**
 * Represents a type adapter for collection types
 * 
 * @author Xueqiang Mi
 */
public class CollectionTypeAdapter implements CustomTypeAdapter {

    public boolean accept(Type type) {
        if (type instanceof ParameterizedType) {
            Type rawType = ((ParameterizedType) type).getRawType();
            if (rawType instanceof Class<?>) {
                Class<?> clazz = (Class<?>) rawType;
                if (Collection.class.isAssignableFrom(clazz)) {
                    return true;
                }
            }
        }
        return false;
    }

    public TypeDefinition toJsonType(Type type) {
        if (!accept(type)) {
            throw new IllegalArgumentException("unsupported type: " + type);
        }
        
        TypeDefinition td = new TypeDefinition("array");
        ParameterizedType pt = (ParameterizedType) type;

        Type[] args = pt.getActualTypeArguments();
        if (args != null && args.length == 1) {
            TypeDefinition tdArg = Builder.toJsonType(args[0]);
            td.getItems().add(tdArg);
        }
        return td;
    }

    public TypeDefinition toJavaType(Type type) {
        return new TypeDefinition(type.toString());
    }
}
